不同密度下玉米雌雄穗开花间隔与产量关系研究

Study on Relationship Between Anthesis-silking Interval of Maize in Different Densities and Yield

以70年代以来我国大面积推广的杂交种为材料,在15 000(低)、45 000(中)、75 000(高)株/hm2密度下,研究不同密度对不同年代杂交种雌雄穗开花期间隔(ASI)、产量及相关性状的影响。结果表明,随着密度增加,ASI与产量关系更趋密切。高密度下,ASI与产量显著正相关;中、高密度下不同年代品种间ASI差异显著,且高密度下ASI、产量与年代呈显著直线回归关系。随密度增加,新品种ASI增加变化率减小,但产量增加变化率较大。ASI值可作为品种耐密性鉴定的重要参考指标,不同密度下新品种ASI更趋稳定,耐密性增强。

A time series of hybrids(1970-2000) released widely on their years were grown in three densities of 15 000(low),45 000(intermediate) and 75 000(high) plants/ha.It studied the effects of different densities on ASI,yield and related traits.The result suggested that there was close relation between ASI and yield with the density increased,and that had a significant positive correlation in the high density.The difference of ASI among different years was significant.Regression of ASI or yield was significant wit...